New Words：

thumb [θʌm] n. 拇指;大拇指
yuck [jʌk] (表示憎厌)讨厌，可恶
yucky [ˈjʌki] adj. 讨厌的;令人生厌的;令人厌恶的

Sample Sentences：

The food in the school is yucky.
Yuck, that fish smells disgusting.
She had a painful cut on her thumb.
He took the pen between his thumb and forefinger.
What does it mean when a Chinese holds his or her thumb up to you?

disgusting [dɪs'ɡʌstɪŋ] adj. 极糟的；令人不快的；令人厌恶的；令人作呕的；恶心的
forefinger [ˈfɔːrfɪŋɡər] n. 食指

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